<template>

    <nav class="navbar navbar-inverse">
      <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
          <button
            type="button"
            class="navbar-toggle collapsed"
            data-toggle="collapse"
            data-target="#bs-example-navbar-collapse-1"
            aria-expanded="false"
          >
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="#">Brand</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
          <ul class="nav navbar-nav">
            
            <li v-for="(item,index) in routes" :key="index" :class="{active:index==currentIndex}" @click="activeHandler(index)">
              <router-link :to="item.url">{{item.title}}</router-link>
                <!-- <span class="sr-only">(current)</span> -->
            </li>
            
            <li class="dropdown">
              <a
                href="#"
                class="dropdown-toggle"
                data-toggle="dropdown"
                role="button"
                aria-haspopup="true"
                aria-expanded="false"
              >
                Dropdown
                <span class="caret"></span>
              </a>
              <ul class="dropdown-menu">
                <li>
                  <a href="#">Action</a>
                </li>
                <li>
                  <a href="#">Another action</a>
                </li>
                <li>
                  <a href="#">Something else here</a>
                </li>
                <li role="separator" class="divider"></li>
                <li>
                  <a href="#">Separated link</a>
                </li>
                <li role="separator" class="divider"></li>
                <li>
                  <a href="#">One more separated link</a>
                </li>
              </ul>
            </li>
          </ul>
          <form class="navbar-form navbar-left">
            <div class="form-group">
              <input type="text" class="form-control" placeholder="Search" />
            </div>
            <button type="submit" class="btn btn-default">Submit</button>
          </form>
          <ul class="nav navbar-nav navbar-right">
            <li>
              <a href="#">Link</a>
            </li>
            <li class="dropdown">
              <a
                href="#"
                class="dropdown-toggle"
                data-toggle="dropdown"
                role="button"
                aria-haspopup="true"
                aria-expanded="false"
              >
                Dropdown
                <span class="caret"></span>
              </a>
              <ul class="dropdown-menu">
                <li>
                  <a href="#">Action</a>
                </li>
                <li>
                  <a href="#">Another action</a>
                </li>
                <li>
                  <a href="#">Something else here</a>
                </li>
                <li role="separator" class="divider"></li>
                <li>
                  <a href="#">Separated link</a>
                </li>
              </ul>
            </li>
          </ul>
        </div>
        <!-- /.navbar-collapse -->
      </div>
      <!-- /.container-fluid -->
    </nav>

</template>

<script>
export default {
  name: "TabHeader",
  data() {
    return {
        routes:[
            {url:'/', title:'首页'},
            {url:'/note', title:'笔记'}
        ],
        currentIndex:0
        }
    },
    methods: {
            activeHandler(index){
                this.currentIndex = index
            }
        },
     created(){
        // console.log(this.$route)

        for(var i = 0;i < this.routes.length;i++){
            if(this.routes[i].url == this.$route.path){
                this.currentIndex = i;
                return;
            }
        }
    }
};

</script>

<style scoped>

</style>

